DE102004057709A1 - Self-tapping screw-in body e.g. for artificial acetabulum, has outer surface is partially curved or bent in threaded area, and has thread interrupted by flute - Google Patents
Self-tapping screw-in body e.g. for artificial acetabulum, has outer surface is partially curved or bent in threaded area, and has thread interrupted by flute Download PDFInfo
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- DE102004057709A1 DE102004057709A1 DE102004057709A DE102004057709A DE102004057709A1 DE 102004057709 A1 DE102004057709 A1 DE 102004057709A1 DE 102004057709 A DE102004057709 A DE 102004057709A DE 102004057709 A DE102004057709 A DE 102004057709A DE 102004057709 A1 DE102004057709 A1 DE 102004057709A1
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/32—Joints for the hip
- A61F2/34—Acetabular cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30317—The prosthesis having different structural features at different locations within the same prosthesis
- A61F2002/30322—The prosthesis having different structural features at different locations within the same prosthesis differing in surface structures
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3082—Grooves
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3082—Grooves
- A61F2002/30825—Grooves arcuate
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30841—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes
- A61F2002/30845—Sharp anchoring protrusions for impaction into the bone, e.g. sharp pins, spikes with cutting edges
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
- A61F2002/30858—Threads interrupted by grooves or sidewalls, e.g. flat sidewalls
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/3085—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves with a threaded, e.g. self-tapping, bone-engaging surface, e.g. external surface
- A61F2002/30873—Threadings machined on non-cylindrical external surfaces
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0014—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis
- A61F2250/0026—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof having different values of a given property or geometrical feature, e.g. mechanical property or material property, at different locations within the same prosthesis differing in surface structures
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2250/00—Special features of prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2250/0058—Additional features; Implant or prostheses properties not otherwise provided for
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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- Public Health (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Cardiology (AREA)
- General Health & Medical Sciences (AREA)
- Transplantation (AREA)
- Veterinary Medicine (AREA)
- Mechanical Engineering (AREA)
- Prostheses (AREA)
- Dowels (AREA)
- Dental Prosthetics (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Surgical Instruments (AREA)
Abstract
Description
Die Erfindung betrifft einen selbstschneidenden Einschraubkörper mit einer mindestens partiell im Gewindebereich gekrümmten oder geknickten Mantelfläche und einem durch mindestens eine Spannut unterbrochenen Gewinde mit in Vorschubrichtung gekipptem Gewindezahnprofil gemäß den Ansprüchen 1 bis 3, wie z.B. einer einschraubbaren künstlichen Hüftgelenkpfanne gemäß Anspruch 4, bei welchem die zwischen Spannut und Gewindezahn gebildete Schneidkante auf die der Vorschubrichtung entgegengesetzte Seite des Gewindezahns verlagert ist, bzw. bei welchem die Schrägungs- oder Drallrichtung der Spannut entgegengesetzt der Drallrichtung des Gewindes verläuft und der Schrägungs- oder Drallwinkel der Spannut größer ist als der Steigungswinkel des Gewindes. Eine derartige Gestaltung ist für bestimmte Anwendungen vorteilhaft, weil dadurch die zum Einschrauben erforderlichen Kräfte ohne nachteilige Auswirkungen auf die sonstigen Eigenschaften merklich reduziert sind.The The invention relates to a self-tapping screw-in with an at least partially in the threaded portion curved or kinked lateral surface and a interrupted by at least one flute thread with in Feed direction tilted thread tooth profile according to claims 1 to 3, such. one screw-in artificial acetabulum according to claim 4, in which the cutting edge formed between the flute and thread tooth shifted to the feed direction opposite side of the thread tooth is or in which the skew or twisting direction of the flute opposite to the twisting direction of the thread runs and the skew or Twist angle of the flute is larger as the pitch angle of the thread. Such a design is for certain applications advantageous, because thereby the screwing required forces without Adverse effects on other properties noticeable are reduced.
Gewinde sind als konstruktive Elemente des allgemeinen Maschinenbaus weit verbreitet. Gewöhnlich sind Gewinde zylinderförmig gestaltet. Daneben sind auch konische Gewinde z.B. für Ölfeldrohre in Gebrauch. Eine große Anzahl verschiedener Gewindeprofile sind bekannt und in Normen festgelegt. Üblicherweise ist das Gewindeprofil an einem Werkstück unveränderlich, das heißt, daß das Gewindeprofil am Gewindeanfang identisch mit dem am Gewindeende ist. Es sind jedoch Ausnahmen vorstellbar, bei denen eine zumindest in einem Teilbereich des Gewindes fließend sich ändernde Formgestalt des aus Gewinderille und Gewindezahn gebildeten Gewindeprofils von Vorteil sein könnte, z.B. um das Einführen eines Schraubengewindes in ein Mutterngewinde zu erleichtern.thread are far as constructive elements of general engineering common. Usually are threads cylindrical designed. In addition, conical threads, e.g. for oil field pipes in use. A big Number of different thread profiles are known and defined in standards. Usually is the thread profile on a workpiece immutable, that is, that the thread profile at the beginning of the thread is identical to the thread end. It is, however Exceptions conceivable in which one at least in a subarea of the thread flowing changing Shaped shape of the thread groove formed from thread groove and thread profile could be beneficial e.g. about insertion a screw thread in a nut thread easier.
Spezielle geometrische Verhältnisse in Bezug auf das Gewinde bestehen jedoch vor allem bei Gewinden auf gekrümmten Flächen, wie sie insbesondere bei einschraubbaren künstlichen Hüftgelenkpfannen vorkommen. Hier sind hinsichtlich der Mantelform des Schalenkörpers z.B. hypo-, hemi-, oder hypersphärische, konischsphärische, parabolische toroidische, elliptische und ähnliche Geometrien bekannt. Bei spanenden Herstellungsverfahren für die Herstellung derartiger Schraubpfannen ergeben sich teilweise zwangsläufig fließend sich verändernde Verzerrungen des Gewindeprofils, welche in den meisten Fällen weder beabsichtigt noch erwünscht sind. Insbesondere bei der Benutzung von Gewindezähnen mit unsymmetrischen Flanken (den jeweiligen Seitenwinkeln des Gewindezahns) ergibt sich das Phänomen, daß je nach Kipprichtung des resultierenden Gewindezahns die Zahnhöhe vom Pfannenäquator in Richtung zum Pfannenpol hin fließend zu- bzw. abnimmt, woraus sich dann am polnahen Gewindeanfang entweder viel zu große oder nahezu verkümmerte Gewindezähne ergeben. Im ersten Fall führen die extrem großen Gewindezähne dazu, daß zum Einschrauben der Pfanne sehr hohe Kräfte erforderlich werden, bzw. das Implantat nicht bis zum vollständigen Knochenkontakt eingeschraubt werden kann. Im zweiten Fall wird lediglich eine sehr dürftige Primärfixation zu erreichen sein. In beiden Fällen besteht die Gefahr des Auslockerns des Implantats, welches als Konsequenz eine nochmalige Operation des Patienten bedeuten würde.Specific geometric relationships in terms of the thread, however, exist mainly in threads on curved surfaces, as they occur especially with screw-in artificial hip joint sockets. Here, with regard to the shell shape of the shell body, e.g. hypo, hemi, or hyperspheric, konischsphärische, parabolic toroidal, elliptical and similar geometries known. In machining manufacturing processes for the production of such Screw pans are sometimes inevitably flowing changing Distortions of the thread profile, which in most cases neither Intended to be desired are. Especially when using thread teeth with unbalanced flanks (the respective side angles of the thread tooth) results in the phenomenon that depending on Tipping direction of the resulting thread tooth the tooth height of the pan equator in Towards the Pfannenpol towards flowing increases or decreases, from what then at the polnahen thread start either too big or almost stunted thread teeth result. In the first case lead the extremely big thread teeth to that to the Screwing in the pan requires very high forces, or the implant is not screwed in until complete contact with the bone can be. In the second case, only a very poor primary fixation to be reached. In both cases There is a risk of loosening of the implant, which as a consequence would mean a second operation of the patient.
Ein weiteres Problem besteht bei Einschraubkörpern mit gekrümmter Mantelfläche darin, daß sich die einzelnen Gewindezähne beim Einschrauben in eine entsprechend ausgeraffelte Kavität nicht – wie häufig angenommen – gleichzeitig oder gar mit dem in Einschraubrichtung vorn liegenden Gewindeanfang zuerst eingraben. Es ist vielmehr so, daß sich z.B. bei sphärischen Hüftgelenkpfannen mit vier Gewinderippenumläufen der vom Äquator aus gesehen zweite Umlauf zuerst eingräbt, gefolgt vom ersten und dritten Umlauf. Erst danach, wenn sich die genannten drei Umläufe bereits weitgehend eingegraben haben, kommt der vierte Umlauf in Kontakt mit der Kavität. Weil nun die Zähne des ersten bis dritten Umlaufs in der geschnittenen Rille zwangsweise geführt sind, unterliegt der vierte Gewindeumlauf hinsichtlich seiner Eindringrichtung diesem Zwang. Bei einem gekippten Gewindezahnprofil entsteht dann ein Schieben welches auf eine Seite des Gewindezahnprofils verlagert ist.One Another problem with Einschraubkörper with curved lateral surface is that the individual thread teeth when screwed into a correspondingly dislocated cavity not - as often assumed - simultaneously or even with the beginning of threading in the screwing direction dig first. Rather, it is such that e.g. in spherical acetabular with four thread ribbed circulations from the equator seen from second round first digested, followed by the first and third round. Only then, if the mentioned three rounds already have largely buried, comes the fourth circulation in contact with the cavity. Because now the teeth of the first to third rounds in the cut groove forcibly guided are subject to the fourth thread revolution in terms of its direction of penetration this constraint. When a tilted thread tooth profile arises then a push which shifts to one side of the thread tooth profile is.
Aus Rechenmodellen mit finiten Elementen ist bekannt, dass sich eine günstigere Lastübertragung zwischen Implantat und knöchernem Lager durch ein Überkippen des Gewindezahns zum Pfannenpol hin erzielen lässt. Dies resultiert aus der räumlichen Lage des Hauptlastvektors im Bewegungszyklus beim Gehen während des Aufsetzens des Hackens und der relativen Position der implantierten Hüftgelenkpfanne. Wenn das Gewindezahnprofil nun entsprechend in Richtung zum Pfannenpol gekippt ist und die Drallrichtung der Spannut wie üblich der Drallrichtung des Gewindes entspricht, kann die einseitig zwischen Gewindezahn und Spannut in Richtung zum Pfannenpol gebildete Schneidkante keine Wirkung entfalten. Ein unerwünscht hoher Wert des Einschraubdrehmoments ist die Folge dieses Problems.Out Computational models with finite elements is known to be a favorable load transfer between implant and bony Warehouse by tipping over of the thread tooth to the Pfannenpol can be achieved. This results from the spatial Posture of the main load vector in the motor cycle while walking during the Putting the hacking and the relative position of the implanted Acetabulum. If the thread tooth profile now tilted towards the Pfannenpol accordingly is and the swirl direction of the flute as usual the swirl direction of the Thread corresponds, which can be unilaterally between thread tooth and Flute in the direction of the Pfannenpol formed cutting edge none Unfold their effect. An undesirable high value of the screwing torque is the result of this problem.
Der
oben geschilderte Sachverhalt ist zumindest teilweise Gegenstand
der Europäischen
Patentschrift
Es bestand daher die Aufgabe zur Schaffung von spanend auch auf älteren oder nicht entsprechend ausgerüsteten CNC-Maschinen herstellbaren, bzw. alternativen Einschraubkörpern (z.B. in Gestalt von Hüftgelenkpfannen) mit einem mindestens in einem Teilbereich auf einer gekrümmten oder abgewinkelten Mantelfläche liegenden Gewinde mit unsymmetrischen Teilflankenwinkeln des Gewindezahns und einem gegenüber herkömmlichen Einschraubkörpern reduzierten Einschraubdrehmoment.It Therefore, the task was to create machining even on older or not equipped accordingly CNC machines or alternative screw-in bodies (e.g. in the form of acetabular cups) with at least one partial area on a curved or Angled lateral surface lying thread with unbalanced partial flank angles of the thread tooth and one opposite usual screw-in reduced screwing torque.
Die Aufgabe wird nach der Erfindung durch die Zurverfügungstellung eines selbstschneidenden Einschraubkörpers mit einer mindestens partiell im Gewindebereich gekrümmten oder geknickten Mantelfläche und einem durch Spannuten unterbrochenen Gewinde mit in Vorschubrichtung gekipptem Gewindezahnprofil gemäß den Ansprüchen 1 bis 3 gelöst, wie z.B. einer einschraubbaren künstlichen Hüftgelenkpfanne gemäß Anspruch 4, bei welchem die zwischen Spannut und Gewindezahn gebildete Schneidkante auf die der Vorschubrichtung entgegengesetzte Seite des Gewindezahns verlagert ist, bzw. bei welchem die Schrägungs- oder Drallrichtung der Spannut entgegengesetzt der Drallrichtung des Gewindes verläuft und der Drallwinkel der Spannut größer ist als der Steigungswinkel des Gewindes.The The object is according to the invention by the provision a self-tapping screw-in with at least one partially curved in the threaded area or kinked lateral surface and interrupted by flutes thread with in the feed direction Tilted thread tooth profile according to claims 1 to 3 solved, such as. a screw-in artificial acetabulum according to claim 4, in which the cutting edge formed between the flute and thread tooth on the feed direction opposite side of the thread tooth is shifted, or in which the helical or helical direction of the Flute opposite to the twisting direction of the thread runs and the helix angle of the flute is larger as the pitch angle of the thread.
Im Bereich der Technik sind rechts gedrallte Gewinde Standard. Links gedrallte Gewinde sind besonderen Anwendungen vorbehalten, z.B. wenn bei einer entsprechend gerichteten Torsionsbeanpruchung eine Lockerung der Gewindeverbindung zu erwarten ist. Dem gemäß ist allgemein die Erwartungshaltung tief verwurzelt, eine Schraubverbindung rechtsgängig festzuziehen und linksgängig zu lösen. Alle Schraubdeckel und Schraubkappen sind derart gestaltet, auch z.B. selbstschneidende Schrauben. Bei Einschraubkörpern (z.B. künstlichen Hüftgelenkpfannen) ist das nicht anders. Sind Einschraubkörper durch Spannuten selbstschneidend ausgelegt, so verlaufen diese Spannuten häufig neutral, also mit einem Drallwinkel von null Grad. Der Querschnitt des jeweiligen Gewindezahns bildet dann eine Schneidfläche, welche wegen des Steigungswinkels des Gewindes ganz leicht positiv steht. Manche selbstschneidenden Blechschrauben besitzen leicht links gedrallte oder leicht schräg nach links verlaufende Spannuten, die allerdings lediglich den Steigungswinkel des Gewindes kompensieren und dann mit ihrer Schneidfläche neutral positioniert sind. Links gedrallte Spannuten sind zum Beispiel bei Gewindebohrern bekannt, welche bei Durchgangsgewinden die beim Schneiden anfallenden Späne nach unten hin abtransportieren sollen.in the Field of technology are right-twisted thread standard. Left twisted threads are reserved for particular applications, e.g. if a suitably directed Torsionsbeanpruchung a Loosening of the threaded connection is expected. Accordingly, it is general the expectation deep-rooted tighten a screw connection to the right and left-handed to solve. All Screw caps and screw caps are designed, also e.g. self-tapping screws. For screw-in bodies (for example artificial Acetabular cups) is not that different. Screw-in units are self-tapping due to flutes designed, these flutes are often neutral, so with a Twist angle of zero degrees. The cross section of the respective thread tooth then forms a cutting surface, which due to the pitch angle of the thread quite slightly positive stands. Some self-tapping sheet metal screws are light left twisted or slightly oblique to the left flutes, but only the pitch angle compensate for the thread and then neutral with its cutting surface are positioned. Links twisted flutes are included, for example Taps known which in through threads during cutting accumulating chips to transport away down.
Bei künstlichen Hüftgelenkpfannen sind ausschließlich Rechtsgewinde bekannt. Die Gewindezähne stehen bei den meisten Produkten vertikal zur Pfannenachse. Wenn diese Hüftgelenkpfannen eine gekrümmte oder geknickte Mantelkontur, gerade verlaufende Spannuten und eine konstante Gewindesteigung besitzen, dann sind die Kräfte während des Einschraubvorgangs an der durch die Spannuten an den Gewindezähnen gebildeten Schneidflächen und deren mehr oder weniger neutral stehenden Schneidkanten zumindest theoretisch gleichmäßig verteilt. Wegen der vom Operateur in axialer Richtung während des Einschraubens ausgeübten Andruckkraft (geschätzt: ca. 50 bis 100 N) verlagert sich die Schneidkraft jedoch mehr auf die polwärts liegende Schneidkante des Gewindezahns. Es ist dann überaus sinnvoll, diese Seite mit einer Schneidkante mit positivem Schneidwinkel zu gestalten, weil damit der Einschraubkraftbedarf deutlich reduzierbar ist. Dieses ist in einfacher Weise durch eine rechts gedrallte Spannut mit ausgeprägtem Drallwinkel realisierbar.at artificial acetabular are exclusive Right-hand thread known. The thread teeth are at most Products vertical to the pan axis. If these acetabular cups a curved one or kinked mantle contour, straight flutes and a have constant thread pitch, then the forces are during the Screwing on the formed by the flutes on the thread teeth Cutting surfaces and whose more or less neutral cutting edges, at least theoretically evenly distributed. Because of the pressure exerted by the surgeon in the axial direction during screwing (estimated: approx. 50 to 100 N), the cutting force shifts more the poleward lying cutting edge of the thread tooth. It makes perfect sense then this page with a cutting edge with positive cutting angle too design, because thus the Einschraubkraftbedarf significantly reduced is. This is in a simple way by a right thrown flute with pronounced Twist angle realized.
Es sind bislang drei künstliche Hüftgelenkpfannen mit linksgerichteter Spannut bei gekrümmter Mantelfläche und neutral stehenden Gewindezahn auf den Markt gekommen. Es sind dies das Modell MC der Firma Brehm, das Modell MT der Firma Zimmer, sowie das Modell PAC der Firma DePuy. Bei der ersteren beträgt der Schrägungswinkel 15°, bei den anderen beiden 10°. Der Spanwinkel der hauptsächlich wirkenden Schneidkante ist dann stumpf (Fachbezeichnung „negativ") und führt daher zu einem ungünstig klemmenden, körnenden und insgesamt nicht akzeptablen Schneidverhalten.It are so far three artificial ones acetabular with left flute at curved lateral surface and neutral standing thread tooth came on the market. They are the model MC of the company Brehm, the model MT of the company Zimmer, as well the model PAC of the company DePuy. In the former, the helix angle is 15 °, at the other two 10 °. The rake angle of the main acting cutting edge is then dull (technical term "negative") and therefore leads to an unfavorable pinching, graining and overall unacceptable cutting performance.
Ganz anders stellt sich die Situation dar, wenn das Gewindezahnprofil bei einer gekrümmten Mantelfläche und konstanter Gewindesteigung zum Pol hin geneigt ist. Der Anmelder hat erkannt, dass dann die polseitige Flanke des Zahns beim Einschraubvorgang quasi ohne Vorschub entlang einer Schnittfläche gleitet, während die äquatorseitige Flanke in das volle Material hinein radial von der Pfannenachse weg vorgeschoben wird. Wird nun die letztere Flanke mittels eines linksgerichteten Dralls oder einer linksgerichteten Schrägung der Spannnut, bzw. mittels eines dem Steigungswinkel des Gewindes entgegengesetzt verlaufenden Drall- oder Schrägungswinkels der Spannut mit Schneidkanten mit positivem oder stark positivem Spanwinkel ausgerüstet, so ist der Einschraubkraftbedarf sehr deutlich reduziert. Der Schnitt ist dann bei Einschraubversuchen in geeignetem Hartschaum glatt, ohne Randausbrüche und ohne das Auftreten von Körnung. Außerdem ist die Taktilianz derart erhöht, daß der Aufsetzpunkt des Implantats nun ohne weiteres erfühlbar ist.The situation is quite different when the thread tooth profile is inclined towards the pole with a curved lateral surface and a constant thread pitch. The Applicant has recognized that then the pole-side flank of the tooth slides during the screwing virtually without feed along a cutting surface, while the equatoride flank is advanced into the full material radially away from the pan axis away. Now, if the latter flank by means of a left-handed twist or a left-hand skew of the clamping groove, or by means of a helical or helical angle of the thread opposite the helix or helix angle of the flute equipped with cutting edges with positive or strong positive rake angle, the Einschraubkraftbedarf is very significantly reduced. The cut is then smooth in Einschraubversuchen suitable hard foam, without edge breakouts and without the appearance of grain. In addition, the Taktilianz is increased so that the contact point of the implant is now easily felt.
Zum
besseren Verständnis
soll die Erfindung im folgenden anhand von zwei Zeichnungsfiguren näher erläutert werden.
Als schematisches Beispiel eines Einschraubkörpers mit gekrümmter Mantelfläche wurde
dabei jeweils auf eine vereinfacht gezeichnete Hüftgelenkpfanne zurückgegriffen.
Die
In
der
Mit der Erfindung wird somit ein Einschraubkörper mit selbstschneidendem Gewinde mit einer im Gewindebereich liegenden gekrümmten und/oder geknickten Mantelfläche und in Einschraubrichtung gekipptem Gewindezahnprofil zur Verfügung gestellt, welcher aufgrund der gegenüber der Drallrichtung des Gewindes entgegengesetzten Schrägungs- oder Drallrichtung der Spannut über ein deutlich verbessertes Einschraub- und Überdrehverhalten verfügt und von dem eine Reduzierung der Lockerungsrate erwartet werden kann. Der erfindungsgemäße Einschraubkörper ist ohne technische Probleme und ohne zeitlichen Mehraufwand herstellbar.With The invention thus becomes a screw-in body with self-tapping Thread with a threaded in the area lying curved and / or kinked lateral surface and in the screwing direction tipped thread tooth profile provided, which because of the opposite the twisting direction of the thread opposite skew or twist direction the flute over a significantly improved screwing and overwinding features and of a reduction in the rate of loosening can be expected. Of the Screw-in invention is Can be produced without technical problems and without additional time.
Claims (4)
Priority Applications (21)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004053944A DE102004053944A1 (en) | 2004-11-09 | 2004-11-09 | Replacement hip socket has thread on its outside, inner surface of each thread remaining parallel to lip of socket while angle of outer edge increases with distance from lip |
DE102004057709A DE102004057709A1 (en) | 2004-11-09 | 2004-11-30 | Self-tapping screw-in body e.g. for artificial acetabulum, has outer surface is partially curved or bent in threaded area, and has thread interrupted by flute |
US11/667,248 US8864837B2 (en) | 2004-11-09 | 2005-11-09 | Screw-in element having changing thread profile and method for its production |
DE112005003393T DE112005003393A5 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
JP2007539454A JP4686548B2 (en) | 2004-11-09 | 2005-11-09 | Tapping type screwed body |
PT05808159T PT1816986E (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
DE502005003393T DE502005003393D1 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
AT05808159T ATE389372T1 (en) | 2004-11-09 | 2005-11-09 | SELF-TAPING SCREW-IN BODY |
JP2007539453A JP4977614B2 (en) | 2004-11-09 | 2005-11-09 | Screwed body with varying thread profile |
DE112005003388T DE112005003388A5 (en) | 2004-11-09 | 2005-11-09 | Screw-in body with changing thread profile and method for its production |
PCT/DE2005/002014 WO2006050708A2 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
PL05808158T PL1809208T3 (en) | 2004-11-09 | 2005-11-09 | Screw-in member comprising a changing thread profile, and method for the production thereof |
EP05808159A EP1816986B1 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
AU2005304157A AU2005304157B2 (en) | 2004-11-09 | 2005-11-09 | Screw-in member comprising a changing thread profile, and method for the production thereof |
AU2005304158A AU2005304158B2 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
PL05808159T PL1816986T3 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
PCT/DE2005/002013 WO2006050707A2 (en) | 2004-11-09 | 2005-11-09 | Screw-in member comprising a changing thread profile, and method for the production thereof |
US11/667,249 US8206454B2 (en) | 2004-11-09 | 2005-11-09 | Self-cutting screw-in element |
ES05808159T ES2306246T3 (en) | 2004-11-09 | 2005-11-09 | SELF-TAPPING SCREWABLE BODY. |
EP05808158.9A EP1809208B1 (en) | 2004-11-09 | 2005-11-09 | Screw-in member comprising a changing thread profile, and method for the production thereof |
JP2010141847A JP5438604B2 (en) | 2004-11-09 | 2010-06-22 | Method for manufacturing a screw-in body with varying thread profile |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004053944A DE102004053944A1 (en) | 2004-11-09 | 2004-11-09 | Replacement hip socket has thread on its outside, inner surface of each thread remaining parallel to lip of socket while angle of outer edge increases with distance from lip |
DE102004057709A DE102004057709A1 (en) | 2004-11-09 | 2004-11-30 | Self-tapping screw-in body e.g. for artificial acetabulum, has outer surface is partially curved or bent in threaded area, and has thread interrupted by flute |
Publications (1)
Publication Number | Publication Date |
---|---|
DE102004057709A1 true DE102004057709A1 (en) | 2006-06-08 |
Family
ID=38231179
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102004057709A Withdrawn DE102004057709A1 (en) | 2004-11-09 | 2004-11-30 | Self-tapping screw-in body e.g. for artificial acetabulum, has outer surface is partially curved or bent in threaded area, and has thread interrupted by flute |
DE112005003393T Withdrawn DE112005003393A5 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
DE502005003393T Active DE502005003393D1 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
Family Applications After (2)
Application Number | Title | Priority Date | Filing Date |
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DE112005003393T Withdrawn DE112005003393A5 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
DE502005003393T Active DE502005003393D1 (en) | 2004-11-09 | 2005-11-09 | Self-tapping screw-in body |
Country Status (10)
Country | Link |
---|---|
US (1) | US8206454B2 (en) |
EP (1) | EP1816986B1 (en) |
JP (1) | JP4686548B2 (en) |
AT (1) | ATE389372T1 (en) |
AU (1) | AU2005304158B2 (en) |
DE (3) | DE102004057709A1 (en) |
ES (1) | ES2306246T3 (en) |
PL (1) | PL1816986T3 (en) |
PT (1) | PT1816986E (en) |
WO (1) | WO2006050708A2 (en) |
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WO2009090103A1 (en) * | 2008-01-20 | 2009-07-23 | Hoermansdoerfer Gerd | Self-cutting screw-in insert having zigzagging flutes |
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US20100256758A1 (en) * | 2009-04-02 | 2010-10-07 | Synvasive Technology, Inc. | Monolithic orthopedic implant with an articular finished surface |
US20110257753A1 (en) * | 2009-04-02 | 2011-10-20 | Synvasive Technology, Inc. | Implant having a convex surface surrounding a concave articular surface |
GB0907036D0 (en) | 2009-04-24 | 2009-06-03 | Depuy Int Ltd | Surgical prostheses |
GB0918484D0 (en) * | 2009-10-22 | 2009-12-09 | Depuy Int Ltd | A medical implant device |
EP2502604B1 (en) * | 2011-03-21 | 2013-09-25 | Jossi Holding AG | Joint socket implant |
EP2882370B1 (en) * | 2012-08-13 | 2020-06-24 | Camlog Biotechnologies GmbH | Secondary part, set and packaging for a dental implant system |
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-
2004
- 2004-11-30 DE DE102004057709A patent/DE102004057709A1/en not_active Withdrawn
-
2005
- 2005-11-09 PT PT05808159T patent/PT1816986E/en unknown
- 2005-11-09 AU AU2005304158A patent/AU2005304158B2/en not_active Ceased
- 2005-11-09 DE DE112005003393T patent/DE112005003393A5/en not_active Withdrawn
- 2005-11-09 EP EP05808159A patent/EP1816986B1/en not_active Not-in-force
- 2005-11-09 AT AT05808159T patent/ATE389372T1/en active
- 2005-11-09 PL PL05808159T patent/PL1816986T3/en unknown
- 2005-11-09 DE DE502005003393T patent/DE502005003393D1/en active Active
- 2005-11-09 US US11/667,249 patent/US8206454B2/en active Active
- 2005-11-09 ES ES05808159T patent/ES2306246T3/en active Active
- 2005-11-09 JP JP2007539454A patent/JP4686548B2/en not_active Expired - Fee Related
- 2005-11-09 WO PCT/DE2005/002014 patent/WO2006050708A2/en active IP Right Grant
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WO2009090103A1 (en) * | 2008-01-20 | 2009-07-23 | Hoermansdoerfer Gerd | Self-cutting screw-in insert having zigzagging flutes |
Also Published As
Publication number | Publication date |
---|---|
ATE389372T1 (en) | 2008-04-15 |
ES2306246T3 (en) | 2008-11-01 |
EP1816986A2 (en) | 2007-08-15 |
JP2008519216A (en) | 2008-06-05 |
PL1816986T3 (en) | 2008-08-29 |
PT1816986E (en) | 2008-06-30 |
EP1816986B1 (en) | 2008-03-19 |
US20080025817A1 (en) | 2008-01-31 |
US8206454B2 (en) | 2012-06-26 |
WO2006050708A2 (en) | 2006-05-18 |
DE112005003393A5 (en) | 2007-10-18 |
AU2005304158A1 (en) | 2006-05-18 |
AU2005304158B2 (en) | 2008-11-20 |
WO2006050708A3 (en) | 2007-02-22 |
DE502005003393D1 (en) | 2008-04-30 |
JP4686548B2 (en) | 2011-05-25 |
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